Your Samsung monitor probably has a DVI input. So you would need the Apple (or third party) mini display port adapter to DVI. And then a DVI cable from there to your Samsung. Try the LINK to monoprice.com as they stock just about every type of cable there is.

That's fine. Apple charges quite a bit more for the adapter though. Perhaps you can find another store which sells them. Just make sure you get the correct one - and don't forget you'll also need the longer cable from the adapter to your Samsung monitor.